What changed
Factwash tests compressed agent memory across 60 claims, finding that labeled source, certainty, and as-of fields retain epistemic stance about 15 points better than parenthetical prose.
Why it matters
Longer notes do not guarantee that uncertainty and attribution survive compression; explicit fields make those boundaries easier to preserve and audit.
What to do
Store claim, source, certainty, and as-of values separately, then test compression, retrieval, and downstream decisions under disputed or aging evidence.
Caveat
The study uses narrow model and sample coverage, its author is the sole primary rater, and attribution detection has bounded recall.